[Bldg-sim] eQuest 90.1 Window U Values

[Aulbach, John]

Under DOE2 Help, Dictionary/Glass-Type..


 


GLASS-CONDUCTANCE


The conductance of the glazing, excluding the outside air film
coefficient. The conductance given in glass manufacturers' data sheets
usually includes the outside air film resistance for a wind speed of 7.5
mph (summer) or 15 mph (winter). Table 10 <javascript:TL_5625.HHClick()>
can be used to obtain the corresponding value of GLASS-CONDUCTANCE. For
example, if U(7.5 mph) = 0.64 Btu/ft2-hr-F, then GLASS-CONDUCTANCE =
0.79 (by interpolation). For U-values of different glazing types, see
manufacturers' data sheets or the ASHRAE 1989 Handbook of Fundamentals,
p. 27.16-17.

Table 10  
Correspondence between Glass manufacturers U-value and GLASS-CONDUCTANCE
(excluding outside air film) [all values are in Btu/ft2-hr-F (W/m2-K)]

U-Value
(including outside air film)

GLASS CONDUCTANCE

(7.5 mph wind speed)

(15 mph wind speed)

0.1 (0.57)

0.10 (0.57)

0.10 (0.57)

0.2 (1.14)

0.21 (1.19)

0.21 (1.19)

0.3 (1.70)

0.33 (1.87)

0.32 (1.82)

0.4 (2.27)

0.45 (2.56)

0.43 (2.44)

0.5 (2.84)

0.59 (3.35)

0.55 (3.12)

0.6 (3.41)

0.73 (4.14)

0.68 (3.86)

0.7 (3.97)

0.89 (5.05)

0.81 (4.60)

0.8 (4.54)

1.05 (5.96)

0.95 (5.39)

0.9 (5.11)

1.23 (6.98)

1.09 (6.19)

1.0 (5.68)

1.43(8.12)

1.24 (7.04)

1.1 (6.25)

1.64 (9.31)

1.40 (7.95)

1.2 (6.81)

1.87 (10.62)

1.57 (8.91)

1.3 (7.38)

2.13 (12.09)

1.74 (9.88)

 

Josh:

Convert your GLASS-CONDUCTANCE to come up with the appropriate U-Value.

See the attached for an ASHRAE window I did.

Why didn't you start with the ASHRAE run as Base, rather than the
Proposed model first?

John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
701 West Kimberly Ave., Suite 245
Placentia, CA 92870-6342 USA
Phone: 714-524-4402
Fax: 714-524-4407
email: jaulbach at nexant.com
 

 

 


________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Josh
Greenfield
Sent: Thursday, May 22, 2008 3:42 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] eQuest 90.1 Window U Values



I'm to the point in an Energy Model where I'm changing my 'Proposed
Model' to my 'Baseline Model' and I'm having issues changing the window
data.  For the ASHRAE 90.1 region, the Assembly U value needs to be set
to 0.57 and the Assembly SHGC needs to be set to 0.39...where do I input
these numbers??  The only window data values eQuest is letting me change
is Glass Conductance, VLT and Emissivity...

 

 

Josh Greenfield, PE, LEED AP
Senior Associate
Primera Engineers, Ltd.
100 S. Wacker Drive, Suite 700
Chicago, IL 60606
312.606.0910 Main
312.242.6392 Direct
312.606.0415 Fax
jgreenfield at primerachicago.com
<blocked::mailto:jgreenfield at primerachicago.com> 
http://www.primerachicago.com <http://www.primerachicago.com> 

Be Green...please consider the environment before printing this email.

 

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